Supplementary auxiliary apparatus for prime movers



April 25, 1944. F. L. DORNBROOK 3 5 SUPPLEMENTARY AUXILIARY APPARATUSFOR PRIME MOVERS Filed Feb 6, 1942 2 Sheets-Sheet l 61 57 *w "G i E]:- v3334 ATTORNEYS.

April 1944- ,F. DORNBROOK 7,

SUPPLEMENTARY AUXILIARY APPARATUS FOR PRIME MOVERS Filed Feb. 6, 1942 ZShe ecS-Sheet 2 INVENTOR.

ATTORNEYS.

Patented Apr. 25, 1944 SUPPLEMENTARY AUXILIARY APPARATUS FOR PRIMEMOVERS Frederick L. Dcr brook, wa kee Wis, assianic to WisconsinElectric Power Company, Milwaukee, Wis., a corporation of WisconsinApplication February 6, 1942, Serial N9, 429,762

3 Claims Steam turbines are usually provided with oil pumps for thehydraulic operation of their governors and lubrication of theirbearings. Emergency oil pumps are also provided for furnishing thepressure fluid for governor operation and bearing lubrication in casethe regular oil pumps fail. Various means have been provided for drivingthe emergenc oil pumps, but these have not always been foolproof,particularly where the emergency oil pumps are steam turbine driven. i

in central vertical section while one of the parts is taken on thesection line 3-3 of Fig. 2.

In the drawings, the numeral 5 designates the steam turbine and 1 and .8the oil pum s for the hydraulic operation of it governor and lubricationof its bearings, respectively, these pumps usually delivering atdifterent hydraulic pressures and being driven direct by the turbineasthrough a, worm gear 9 or other suitable form of drive connectiontherewith. The hydraulic fluid ,for operating the governor I is suppliedto the pump I from a suitable source of supply through a pipe II anddelivered to the governor through a pipe I2. The lubricant for theturbine is supplied to the pump 8 by a supply pipe I3 and delivered tothe bearings l4 of the turbine through piping I5.

In case either of the regular oil pumps fail, provision is usually madefor cutting in one or more emergency oil pumps for furnishing the fluidfor hydraulic operation of the governor of the main turbine and thelubrication of its bearings, and in the drawings the numeral I6 in eachinstance designates one of these pumps which is adapted to be directlydriven by a small emergency steam turbine II. Each of the turbines I1 isconnected through a pipe I8 with a main steam supply pipe I9 which, asshown in Fig. 3, is provided with a shut ofi valve 29. The oil pumps I6furnish both the hydraulic pressure fluid and the lubricant. Forbringing the oil deliverecl by these pumps down to the lower lubrieatingpressure, the section 2I of the delivery 55 piping from the pumps itwhich connects with the piping. I receives its oil through a reducingvalve 22 connected with the deliver pipe 2-3 of the pumps It. A branchpipe 24 supplies the pressure fluid to the pipe I 2. lassage ofhydraulic fluid from either the pump 1 or the pump to the pumps L6:while th -pumps I or 8 are in operation is prevented by che k valves 25in t p pi g :3. Pass ge of hy rau i fluid f ith r of the umps IE toeither I or 18 when ei h o the pumps I6 a e m p smt is e n e by heckvalve 6., one o thes b ng the p n t and the e he e n i the ipin -l 2.

'The subject of this invention is especially concerned with the controlof the cut oiT valve 29. In the present instance this valve 29 ismounted in a closed position by connection of its slidably oun ed stem21 w a p ston .28 sl dably m nted in the bo e of a cyl nde 29 havin alower closed end 3 which co th ou h a P and piping 32 having a three wayvalve 33 adapte to c nnect by a i e th th p ne 4 in one position of thevalve and with a waste pipe 35 in the other position of said valve. 'Thecylinder 29 has an end cap 36 forming a support for the housing 31 forthe valve 20, this housing being carried by upright studs 38 mounted onthe cap 36. The stem or rod member 21 fOl the valve 2II works through asuitable stuffing box 39. During normal operation of the turbine, whenthe pumps =1 and 8 are being driven thereby, the pressure of thehydraulic fluid is com-municated to the space below the piston 28through the piping 1-2, 24, 34 valve 33, and piping 32,

an Port 3-I, and the over all pressure on the piston 28 issuch-as tohold the valve 2!! closed against the steam pressure in the supply lineI9.

The valve 33 is provided with an exterior operating arm 49 which carriesa weight 4| ad justably mounted thereon at its outer end. This weightedarm connects by a latch 42 pivotally mounted on the pin 43, carried bythe arm 49, with a catch 44 carried by an evener bar 45. One end of theevener bar 45 is connected by a pin and slot connection 46 with the rod41 of a piston 48 working in the bore 49 of a control cylinder 59 havingan end cap 5| connected by a pipe 52 with the piping I5 and 2|, so thatp ssure fluid from the lubricant system for the turbine may flow to thebore 49 to act against the piston and its return spring 52 so as tobring the piston-to a stop position defined by the shoulder 53 in thecylinder 59 and under which conditions the evener bar 45 is in alatching position. The other end of the evener bar has a pin and slotconnection 54 with the rod 55 of a piston 56 operating in a bore 5'! ofa cylinder 58. The cylinder 58 has an end cap 59 connected with piping60 that connects with the piping I2, 24, so that the normal pressure ofthe hydraulic governor operating fluid acting upon the piston 56 willurge it to a stop position against the shoulder 6| and also compress thereturn spring 62 interposed between the piston and a rear end cap 63.evener bar 45 is in its position of equilibrium with the latch 42engaging the catch 44. To facilitate this engagement the latch 42 isnormally acted upon at its lower end by its leaf spring 64 and islimited in its latching movement by a stop 65. If for any reason thepressure in either the governor operating fluid supply or the lubricantsupply for the main turbine 5 should drop below its normal predeterminedoperating pressure, then either the piston 48 or the piston 56 willunder the action of its spring 52 or 82, respectively, move outwardlytoward the cap 5| or 58, respectively, and thus cause an angularshifting of the evener bar 45 with its consequent release from the latch42, so that the arm 4|] then drops through the action of the weight 4|and turns the three way valve 33 to an open position in which the pipe34 is shut ofi and the oil under piston 28 holding the valve closed isfree to drain through piping 32 and 35 to atmosphere, thus permittingthe steam pressure acting on the valve 20 to immediately open the sameand allow steam to flow through the supply pipe l9 to either of theturbines l1 whose throttle valve has been opened so as to start thedrive of one of the pumps l6 which then continues to furnish its supplyof pressure fluid for supplying the governor operating fluid and thelubricant to the main turbine until either of the pumps 1 or 8 that hasgone out of commission has been repaired. r

In each instance the numeral 66 designates a valve controlling thepassage or hydraulic fluid from either the piping I5, 21 or I2, 24 towaste or drain. I v

I desire it to be understood that this invention is not to be limited toany particular 'form or arrangement of parts except in so far as suchlimitations are included in the claims.

What I claim as my invention is: r

1. In power generating equipment having a main steam turbine and anauxiliary steam turbine, a pump for furnishing hydraulic governoroperating fluid for said main turbine at a predetermined pressure, apump for furnishing lubri- Under these conditions the cant to said mainturbine at another pressure, means for driving said pumps from said mainturbine, and an emergency hydraulic fluid pump driven by said auxiliaryturbine, control mechanism for said auxiliary turbine comprising a valvecontrolling the supply of steam to said auxiliary turbine, andhydraulically controlled means dependent upon the proper supply ofhydraulic fluid at said different pressures by the first and secondnamed pumps respectively for controlling said steam valve.

2. In power generating equipment having a main steam turbine and anauxiliary steam turbine, a pump for furnishing hydraulic governoroperating fluid for said main turbine at a predetermined pressure, apump for furnishing lubricant fluid to said main turbine at anotherpressure, means for driving said pumps from said main turbine, and anemergency hydraulic fluid pump driven by said auxiliary turbine, controlmechanism for said auxiliary turbine comprising a valve controlling thesupply of steam to said auxiliary turbine, hydraulically operated meansfor exerting a closing pressure on said valve, and means normallyequalized between the pressures of said pumps for the main turbine forrelieving said closing pressure operable on the failure of either ofsaid first named pumps to supply the main turbine with the proper amountof fluid.

3. In power generating equipment having a main steam turbine and anauxiliary steam turbine, a pump for furnishing hydraulic governoroperating fluid for said main turbine, a pump for furnishing lubricantfluid to said main turbine, means for driving said pumps from said mainturbine, and an emergency hydraulic fluid pump driven by said auxiliaryturbine, control mechanism for said auxiliary turbine comprising a valvecontrolling the supply of steam to said auxiliary turbine, meansoperable by the hydraulic fluid from one of said pumps for holding saidsteam valve closed, and means for relieving the closing pressure uponsaid steam valve comprising a cut off and drain valve, gravity-actuatedmeans for moving said last named valve to a drain position, latchingmeans for normally holding said gravityactuated means in an inoperativeposition including an evener bar and fluid pressure operated means foreach end of said bar, one of said last named means operating in responseto the pressure of the governor operating fluid and the other of saidlast named means operating in response to the pressure of the lubricantfluid.

FREDERICK L. DORNBROOK

